Propagate drag-and-drop key modifiers to WebView's guest renderer.

content/public/common/drop_data.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A struct for managing data being dropped on a WebContents.  This represents
 // a union of all the types of data that can be dropped in a platform neutral
 // way.
 
 #ifndef CONTENT_PUBLIC_COMMON_DROP_DATA_H_
 #define CONTENT_PUBLIC_COMMON_DROP_DATA_H_
@@ skipping 57 matching lines @@
   // |html_base_url| is the URL that the html fragment is taken from (used to
   // resolve relative links).  It's ok for |html_base_url| to be empty.
   base::NullableString16 html;
   GURL html_base_url;
 
   // User is dragging data from the webview (e.g., an image).
   base::string16 file_description_filename;
   std::string file_contents;
 
   std::map<base::string16, base::string16> custom_data;
+
+  // The key-modifiers present for this update, included here so BrowserPlugin
+  // can forward them to the guest renderer.
+  // TODO(wjmaclean): This can probably be removed when BrowserPlugin goes
+  // away, https://crbug.com/533069.
+  int key_modifiers;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_DROP_DATA_H_